Bobbin-case latch for sewing machines



June 1925- 1,539,859 G. w. NELSON.

BOBBIN CASE LATCH FOR SEWING MACHINES Filed Feb. 15, 1923 ,J 25 10 22 iNVENTOR .12 HIS KTTORNQY I 2 claim Patented June 2, 1925.

UNITED STATES PATENT OFFICE.

ASSIGNOR TO THE STANDARD SEWING OHIO, A CORPORATION OF OHIO.

BO'BBIN-CASE LATCH FOR SEWING MACHINES.

Application filed February 15, 1923. Serial No. 619,180.

To all whom it may concern:

Be it known that I, GEORGE WV, NELSON, a citizen of the United States,and a resident of Cleveland, in the county of Guyahoga and State ofOhio, have invented certain new and useful Improvements in Bob bin-CaseLatches for Sewing Machines; and I do hereby declare the following to bea full, clear,and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to bobbin-case latches for sewing machines, andespecially to bobbin-case latches of the type adapted to hold anon-rotary bobbin-case in its operative position within the open chamberof a rotary hook. Some latches of this type, and the kind to which mypresent invention particularly relates, comprise a pivoted membermovable to and from a closed position in front of the hook chamber forholding the bobbin-case therein, and a latch for engaging saidbobbin-case holding member and securing it in its closed position. The.pivoted holding member when in its closed position should besufficiently close to the bobbin-case to hold the latter in its seat inthe hook chamber but at the same time provide sufficient space betweenthe same for the proper clearance of the needle thread loop when beingcarried over the face of the bobbin-case by the hook. To provide forsuch proper positioning of the holding member relative to the face ofthe bobbincase in a convenient and accurate way, whereby to adapt it toany variation in the size or position of the parts, or thesize of thethread to be used, has been the object of the present invention. To thisend, the invention consists in providingan adjustable support for thelatch by means of which the position of-the latch and associatedbobbin-case holder may be adjusted to thereby control the position ofthe holder relatively to the face of the bobbin-case.

Referring now to the accompanying drawings forming a part of thisspecification, in which I have shown only so much of asewing machine asis necessary for the illustration of my invention,

Figure l is a front end elevation of a supporting bracket for attachmentto the under side of a sewing machine bed-plate, the same carrying arotary hook with its in the said hook chamber contained bobbin-case andmy improved bobbin-case holder and latch;

Fig. 2 is a side elevation of the same as viewed from the right in Fig.1;

F 1g. 3 is a top plan View with the hook partly broken away to moreclearly show the seating of the bobbin-case therein;

Fig. l is a sectional elevation, with the section taken on line H ofFig.3, showing the holder and its latch in normal closed position byfull lines and in open released position by dotted lines, the rotaryhook being omitted;

Figs. 5 and 6 are similar views on an enlarged scale, showing differentadjustments of the holder as effected by a shifting of the adjustablefulcrum support for the latch proper, and

Fig. 7 is a section'on line 7-7 of Fig. 3, showing the spring-pressedpin for automatically throwing the holder to its open position whenreleased by the latch.

Similar reference characters indicate like parts inthe several figuresof the drawings.

The hook, bobbin case, and bobbin-case holder and latch here'shown, arethe same in a general way as those disclosed in PatigisNo. 1,274,188,granted to me July 30,

The hook and associated parts are carried by a bracket 2, adapted to besuitably connected with the bed-plate of the machine, in a manner, forinstance, as disclosed in Patent No. 1,228,125,. granted to me. May 29,1917. J ournaled in this bracket is a rotary hook shaft 3 carrying atits front end an attached hook 4 having an open chamber in its faceside. Removably seated in the chamber of said hook is a bobbin-case 6,which is formed 96 with a peripheral race-bearing surface 7 adapted tobe seatedin a race-way 8 formed adjacent the front side thereof. v a

The bobbin-case 6 is' adaptedto be re- 1 .movably retained in itsoperative position in the open hook chamber by means of a holder locatedin front of said chamber. This holder is here shown in the form of acup-shaped disc 9 adapted to substantially 1 5 cover the face side ofthe bobbin-case and being attached to a plate 10 having two ears 11, 11,at its opposite sides pivoted to two forwardly projecting arms 12,12, ofthe supporting bracket 2, by means of pivot pins 1 3, 13,'jj whereby theholder; ma "be swung outwardly from the face of the k to an inclinedposition, as shown by dotted lines; in Fig. 4, permittingof the ready1n-. sertionv ,or removal of the bobbin-case and bobbin. When the holderis closed, it is held in such position by which is pivotally mounted atone end in an arm of the bracket 16 for latching engagement with anadjacent case.

As hereinbefore' referred to, the 'ho lderi) bobbin-case to'holdthe'lattet to its seat in the} hook but'at' the same tirheprovidesufficient spacebetween'thesame forthe proper clearanceof thejneedlethread when being carried overthe face of the bobbin-case by the hook.As a simple and efficient way of efiecting the proper adjustment of this'holderrelatively to the bobbin-case, I have tively to the face of thebobbin-case as; ef-

-fected "by-a turning of the eccentric "pivot for the latch. After theeccentric has been turned to adjust-the parts, it is secured in itsadjusted position by means of afset- The rocker 20 may be turned byanysui't- (able means to adjust" the eccentric 21, the

same as here shown being provided'with a lever handle 23' at the'oute'rend thereof where it may be conveniently graspedby the-operator. 1 Y

- The latch 14 having the" notch 1 30i latching engagelnentwith theholder arm 17 provides a positive connection between the latchand holderwhereby any "forward and backward movement givento the latch by anadjustment of its eccentric 'piyotfsii'prt wilhbe pOsit-ive'lyflimparted to the holder. ,While this" positive connection between latchand holder is desirable, it

1s not n cessary for latching purposes, as, it

-wi-11 be understood that fa single? shoulder on'the latch forengagementwith the holder,

Such as' afforded y the front wall of fthe notch will be 'lifiicientl A"spring-pressed in '26 seated in an in the front en of'on'e ofthebracket arms12, (see 'Figf--7 and manner means of a latch 14 2 and has anotch iwalls'of said note x 4 in the bracket arm and r to the face thebobbinable bobbih case holder,

latter to its open position when released by the latch 14'. This pinpressing outwardly against the holder also eervewtoflmaintain the latterin engagement withthe front wall 7 of the notch 16 whereby the holderwill be caused to move with the latch during any adjustment oft'he"latter by its eccentric su port 21, independentl of'the engaemdiltcof thereanwalho'f henoteh 1'6,, w%th said'holder. 3 H, The latch141's preferablyf mounted on its pivot support within a notch 26 in theupper side er; the'bracket arm whereby it m 1 be guided in itsrockih?movements and held against lateral dis acemen't by the side A] spring 27sea'ted within the notch 26 pressin'g'upwa'rdly against the rear end ofthe 'lat'cli'hl serves toyieldinglyfhold the latter in its normallatching; "sitijoilii; l The'bobbi'n-casfe may d' againsti rotation withthe'hook 'during the v V of theinachine inany usual or suitable waAsher-e shown an arinBOat theiupperfsi e of the bobbin-case engages theholder with} in a notch 31 thereinforsuch purpose 7 What I claim is zfor retaining the holder folosed position,

l i r e nPPQ t e i t hfediu able' to shift the latch and tliereb(pgiIilLiQl the position 'bfthe holder relative to; the

bobbin-case screw '22 threaded into the bracketa-rin 15 for engagementwith the ececntric-carryi-ng rocker 20.

t f e nel chinegthe 'cc m mt qt a rotary hook have an oper'r'chamb'er inits' fa ce side, a non otar bobbin-ease 'lo'oseiy 'eated in saidchamber.and a inevn lb il t'ch e' lreaih h h e L i diwis a d a eccentr cpivot for sai'd l tch a 'uste bl'e to shi'ftthlateh and thereb -tantrathe posi- :tion of the holder relatively to h bobblecase, i

inla win mem "timeshare with "a rotary hook having] an open, chamberinsits face side, a nonfrotary bobbin-case I i loosely'seagted in saidchamber; I 1 I able bobbin-case holder, of a latc h for reand a, movit'h 'hdde files pq 'i t in; a w ermi n e'd in a stationary su port andlawin: arieeeentri which wa fae'chfijti associated' eceentric tos'hitlielatch and thereby .control 'the pds itioif of the holderrelativelyto the bobbin-case. q

4. Ina sewing mtklhinefthe combination loosely" seated were theater; 1mmmov- 1. In a sewing machinefthe coinbinaltioh'able'bobbin-caflseholdenjof a pivotedfla teh e 1'11:

able bobbin-case holder, of a latch for retaining the holder in closedposition, and a rocker mounted in a stationary support and having aneccentric on which the latch is pivoted, said rocker having an operatinghandle for turning the same and associated eccentric to adjust theposition of the connected latch.

5. In a sewing machine, the combination with a rotary hook having anopen chamber in its face side, a non-rotary bobbin-case loosely seatedin said chamber, and a movable bobbin-case holder, of a latch forretaining the holder in closed position, a rocker mounted in astationary support and having an eccentric on which the latch ispivoted, said rocker having an operating handle for turning the same andassociated eccentric to adjust the position of the connected latch, andmeans for securing the rocker in adjusted position.

6. In a sewing machine, the combination with'a rotary hook having anopen chamber in its face side, a non-rotary bobbin-case loosely seatedin said chamber, and a movable bobbin-case holder, of a latch releasablyconnected with the holder for retaining the latter in closed position,and an eccentric pivot for the latch adjustable to shift said latch andconnected holder to regulate the position of the latter relatively tothe bobbin-case, and means for securing the eccentric pivot in adjustedposition.

7. In a sewing machine, the combination with a rotary hook having anopen chamber in its face side, a non-rotary bobin-case loosely seated insaid chamber, and a pivoted bobbin-case holder, of a pivoted notchedlatch for connection with the holder to retain the latter in closedposition, an eccentric pivot for the latch adjustable to shift saidlatch and connected holder to regulate the position of the latterrelatively to the bobbin-case, and means for securing the eccentricpivot in adjusted position.

8. In a sewing machine, the combination with a rotary hook having anopen chamber in its face side, a non-rotary bobbin-case loosely seatedin said chamber, and a pivoted bobbin-case holder, of a latch movable toand from a position of latching engagement with the holder for retainingthe latter in closed position, and a support for said latch adjustableto shift the latch relatively to the holder and thereby control theposition of the latter relatively to the bobbin-case.

In testimony whereof I aflix my signature.

GEORGE W. NELSON.

